Internal combustion engine



April 11,1939. cEc 2,154,322

INTERNAL COMBUSTION ENGINE Filed June 3, 1936 2 Sheets-Sheet l I Eh I!" 1 1.9 fi

10 I I L.F my

April 11, 1939- L. F. CECIL INTERNAL COMBUSTION ENGINE Filed June 5, 1936 2 SheetsSheet 2 part of this spe Patented Apr.

UNITED STATES PATENT OFFICE r j 2,154,322

INTERNAL COMBUSTION ENGINE Lloyd new, Shanghai, China Application June 3, 1936, Serial No. 83,390 3 Claims. (01. 60-32) lvly invention'relates to internal combustion with the speed of the v 1 experiencedis overheating of particularly to means to ex- A back pressure increases engine. Another difficulty the exhaust valves resulting in warping, burningand sticking of the valves temperature.

bject' of my invention is' the the spent Another object of my'invention is to provide a device of this character inexpensive construction, and require little space the motor design,

which tion and which will not aged by the heat of the which is of simple and which will take up very only slight chang sin will be eflicient in operabe overheated and damexhaust gases.

Other objects and advantages of my invention will be apparent ing description.

In the accompanying drawings,

cification and whe during the course of thefollowwhich form a ein like charactersof reference denote like parts throughout.

. Figure 1 is a bust-ion engine side elevation of an. equipped with my invention,

internal comigure 2 is a similar view showing a modified form of my invention, 3

Figure 3 is a vertical transverse sectional view taken on the line 33 of ,Figure -1, v

Figure 4 is a transverse sectional view through the exhaust blower or pump taken on the line 4-4 of Figure 5, and I Figure 5 is a central longitudinal sectional view thereof taken on the line 5-5 of Figure 4.

In the drawings, wherein for the purpose'of illustration is shown a preferred embodiment ofv this invention, the

numeral designates an internal combustion engine of the conventional L-head type having 'tively connected to the usual crank exhaust manifold I3 and radiahaust valves I2, tor M. The fan the usual pistons H operashaft, ex-

shaft I5 is driven by belt I6 from the engine crank shaft in the usual manner. While the invention is illustrated in connection with the 'L-head type of engine it may obviously be used to advantage in the valve-in head type of engines or in sleeve valve engines.

Theexhaust manifold is usually connected by an exhaust pipe to up an additional a mutileror silencer which sets back pressure on the engine,

but is necessary to the engine. The action of the pistons is relied upon from the efficiency and power of the engine.

riphery and ends of the casing. The lower portion of the casing is provided with a base portion l9 adapted to rest upon the engine head and be bolted thereto. A relatively large opening 20 extends from the water circulating space of the casing vertically downward through the base portion and corresponds with an opening 2! of jacket of the casing.

The forward end 22 of the casing I1 is removable, and is secured in place by suitable bolts 23.

End wall 22 of the casing is provided with a for-.

wardly projecting bearing sleeve 24 extending concentrically of the axis of the casing and having suitable anti-friction bearings therein to engage the blower's'haft 25. A plurality of blower blades 26 radiate from the shaft 25 to points adjacent the inner periphery of the casing. The blades 26 are relatively wide and may be of any desired number, twelve being shown for convenience of illustration The front or bearing end of the blower shaft 25 is provided externally of the casing with a suitable flanged pulley 21 which is engaged by a flexible belt 28 driven from a flanged pulley 29 or the fan'shaft. In place of the pulley and belt drive, any other suitable driving means may be employed, such as a chain and sprocket drive or a gear drive, but the flexible belt construction is preferred.

A conduit or manifold l3 with end of the casing 11 .and has a flange at its end which may be removably bolted to the blower casing. A peripheral exhaust opening 32 extends the entire length of the casing H and compipe 38 connects the exhaust an axial opening 3i in the rear silent operation of the the water jacket around the casing and may have a flexible portion (not shown) as is usual in this pipe. Water passing from the engine to the radiator must pass through the water jacket of casing I1 and will maintain the blower parts at a safe operating temperature. The casing water jacket preferably surrounds the bearing sleeve 24 as seen in Figure 5 to prevent overheating of the bearing.

While it is preferred to drive the blower from the fan shaft which in turn is driven by the en-, gine crank shaft as indicated in Figure 1,. it is contemplated that the blower may have a driving motor of its own. In Figure 2 the blower is driven by a small electric motor 35 mounted on the forward end of the casing l1 and preferably directly connected to the blower shaft 25 to operate the same, In this form of the invention the blower casing is spaced from the front end of the engine to provide room for the motor 35. The other features of the invention shown in Figure 2 are the same as in the other figures. The motor 35 may be driven from a suitable source of current such as the battery of an automobile.

In operation the blower blades are rotated at a relatively high rate of speed by the belt 28 and suck the hot exhaust gases from the manifold 13 and from the engine cylinders through the exhaust valves. A centrifugal pump of the type illustrated in the drawings has a capacity considerably in excess of. the volume of exhaust gases to be handled and will consequently not only remove all of the exhaust gases but will produce a vacuum in the exhaust manifold. The gases pass through pipe 39 axially into the blower casing and are forced through the peripheral discharge opening into exhaust pipe 33. The heat transmitted to the blower parts is removed by the water circulating between the engine and radiator l4, and overheating of the blower is thereby prevented.

The vacuum produced by the blower removes all back pressure from the engine pistons and exhaust valves, and allows the exhaust valves to operate at a much lower temperature than formerly. The blower also has a silencing effect on the gases, and it will be seen that when used on an airplane or similar engine without a muffler, it will serve to silence the gases to a large extent without setting up any back pressure, and an engine so equipped will not only be substantially silenced but will operate at a higher efliciency than would be the case if no blower or muffler were used. The blower may be used with a muffler or it may itself serve as the mufller.

An important feature of my invention is the location of the blower on the forward portion of the engine, preferably atop the engine head. This is not only a convenient location due to the fact that this space is normally not used for other purposes, but it also allows the blower to be readily driven from the fan shaft in a simple manner, and permits the use of the engine water circulating system without the provision of additional water pipes or connections. The water cooling of the blower casing enhances the effectiveness of the blower and greatly increases its life. When used on a valve-in-head engine it may be bolted to the side of the engine, and connected to the engine jacket and radiator.

The blower and its associated parts are of simple construction and are not only inexpensive but add very little to the weight of the engine or the space taken up by the engine. Any suitable type of blower may be employed, but a centrifugal blower of the axial intake and peripheral exhaust type is preferred, and may be used in single or multiple stages, as desired.

WhileI have shown and described the preferred embodiment of my invention it is to be understood that various changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

1. In an internal combustion engine having cylinders, pistons operating therein, a head closing said cylinders, and a cooling jacket surroundingthe cylinders and adapted to have a cooling medium circulated therethrough, said head having an opening in the upper portion thereof, said cylinders having intake and exhaust ports, a blower mounted on said engine head and having its intake connected to the exhaust ports of the cylinders, a cooling jacket surrounding portions of the blower and having an opening registering with the opening in the head whereby the cooling jacket of the blower communicates with the engine cooling jacket, a radiating device connected at its lower end to the engine cooling jacket, means to connect the upper portion of the radiating, device to the blower cooling jacket, and means to operate the blower.

2. In an internal combustion engine having cylinders, pistons operating therein, a head closing said cylinders, acrank shaft operatively connected to the pistons, and a cooling surrounding the cylinders and head and adapted to have a cooling medium circulated therethrough, said head having an opening in the upper portion thereof, said. cylinders having intake and exhaust ports, a blower mounted on the forward portion of said engine head and having on operating shaft extending forwardly of said head, a cooling jacket surrounding portions of the blower. and having an, opening registering with the opening in the head whereby the cooling jacket of the blower communicates with the engine cooling jacket, driving means connecting the forward portion of the blower shaft with the engine, crank shaft, a radiating device connected adjacent its lower end to the engine cooling jacket, and means to connect the upper portion of the radiating device to the blower cooling jacket.

3. In an internal combustion engine having cylinders, pistons operating therein, a head closing said cylinders, and a cooling jacket surrounding the cylinders and adapted to have a cooling medium circulated therethrough, said head having an, opening in the upper portion thereof, said cylinders having intake and exhaust ports, a blower mounted on said engine head and having its intake connected to the exhaust ports of the cylinders, a cooling jacket surrounding portions of the blower andhaving an opening registering with the opening in the head whereby the cooling jacket of the blower communicates with the engine cooling jacket, a radiating device connected at its lower end to the engine cooling jacket, means to connect the upperportion of the radiating device to the blower cooling jacket, and means to operate the blower, said means comprising an electric motor operatively connected to said blower.

. LLOYDF. CECIL.

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